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Excel Opens Outlook Attachment/Digital Cert

Question

OK so the situation is I have one model of computers here that continually open digitally signed forms in protected viewExcel or word). All other models bypass this like they
should. All trust Center settings are identical across all machines.

To fix this issue trying to repair Office does not work but a clean reinstall does. But this is not practical solution because we have about 70 machines in the environment
already.

Only diffence I can find is the versions are slightly different 14.0.6129.5000 (does not work) 14.0.6023.1000 (works) any idea what patch should be removed to roll it back?
or what patch (security update) would cause this?

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